10 more, 10 less gives strategies for mentally finding 10 more or less than a two digit number without having to count or explain the reasoning used. Adding and subtracting by tens by adding or subtracting a one from the tens place. Lyrics What's ten more, what's ten less You don't have to count or guess What's ten less, what's ten more Either way you'll know more sure Take a number and what's 10 more Get the answer right away You don't have to count, worry or doubt Add a 1 to the tens place What's 10 more than 20? Add a 1 to the tens place Ten more than 20 is: 30 OK What's 10 more than 50? Add a 1 to the tens place Ten more than 50 is: 60 OK What's 10 more than 70? Add a 1 to the tens place Ten more than 70 is: 80 OK What's 10 more than 10? Add a 1 to the tens place Ten more than 10 is: 20 OK What's ten more, what's ten less You don't have to count or guess What's ten less, what's ten more Either way you'll know more sure Take a number and what's 10 les